WO2018096615A1

WO2018096615A1 - Chain elongation detection device, chain elongation detection method, and passenger conveyor

Info

Publication number: WO2018096615A1
Application number: PCT/JP2016/084804
Authority: WO
Inventors: 豊橋丘; 礼司山佐; 和利赤澤
Original assignee: 三菱電機株式会社; 三菱電機ビルテクノサービス株式会社
Priority date: 2016-11-24
Filing date: 2016-11-24
Publication date: 2018-05-31
Also published as: JPWO2018096615A1; JP6604615B2; CN109983252A; DE112016007470T5; US20200055710A1; CN109983252B; US10710844B2

Abstract

A chain elongation detection device capable of precisely measuring the amount of elongation in a chain is obtained. A chain elongation detection device that detects elongation of a chain (1) in a transmission device provided with a drive sprocket (2), a driven sprocket (3), and a chain (1) that is wound around the drive sprocket (2) and the driven sprocket (3) and that transmits motive power of the drive sprocket (2) to the driven sprocket (3), wherein the chain elongation detection device is provided with: a meshing height measurement device (4) that measures the meshing height of the chain (1) within the range in which the driven sprocket (3) and the chain (1) mesh; and a signal processing device (5) that, using a signal acquired by the meshing height measurement device (4), determines the difference in height between adjacent rollers (15) in the chain (1) and estimates the amount of elongation in the chain (1) from the determined height difference.

Description

Chain elongation detecting device, chain elongation detecting method and passenger conveyor

The present invention relates to a chain stretch detection device and a chain stretch detection method for detecting chain stretch and a passenger conveyor equipped with the chain stretch detection device.

The chain used for power transmission is stretched in the longitudinal direction due to friction generated between members of the rotary joint portion of the chain due to the operation of the chain over time. This elongation appears as a phenomenon in which the distance between the centers of adjacent rollers in the chain increases. When the chain is stretched, the slack of the chain is increased, which may cause a problem of tooth skipping. Further, the elongation of the chain causes the meshing position, which is the position where the chain and the sprocket are meshed, to move from the tooth bottom of the sprocket toward the tooth tip. As a result, the shear stress generated in the teeth of the sprocket is increased, and there is a possibility that a problem of tooth loss may occur. Normally, when the chain is driven, the sliding oil generated in the rotary joint portion is suppressed by supplying lubricating oil to the rotary joint portion of the chain. However, since this suppresses the acceleration of wear that occurs in the rotating joint portion, it is not possible to prevent the chain from aging due to long-term driving of the chain.

Therefore, conventionally, when the elongation of the chain occurs, the meshing position or the meshing height is measured by using the fact that the meshing position where the chain and the sprocket mesh with each other moves from the tooth bottom to the tooth tip. Measures to prevent problems such as tooth skipping or missing teeth by identifying the amount of chain elongation from the position or meshing height, and grasping the state of chain elongation from the identified chain elongation. For this reason, there is known a chain elongation detecting device (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-199168

However, in the conventional chain elongation detection device, for example, when elongation occurs evenly over the entire region of the chain, the meshing height is uniformly increased at the portion of the chain that meshes with the sprocket. Assumed. Further, in the conventional chain elongation detecting device, when local elongation occurs in the chain, it is assumed that the meshing height is constant in the portion where the chain is elongated.

On the other hand, in an actual chain, the structural characteristics of the chain, the dimensional relationship between the pair of sprockets, the inclination of the line connecting the respective rotation axes of the pair of sprockets to the horizontal plane, the dimension between the pair of sprockets and the pair of sprockets At any position of the part of the chain that meshes with the sprocket, such as the deflection expressed by the difference between the appropriate number of links in the chain calculated from the dimensions between the central axes of the sprocket and the actual number of links in the chain. It is not always possible to measure the meshing height that correlates with chain elongation. Therefore, there is a problem that the accuracy of the measured chain elongation is poor.

The present invention provides a chain elongation detecting device, a chain elongation detecting method, and a passenger conveyor that can accurately measure the amount of chain elongation.

The chain elongation detecting device according to the present invention is a drive sprocket that rotates when a driving force is transmitted, a driven sprocket supported by a rotatable rotating shaft, a drive sprocket and a driven sprocket wound around the drive sprocket. A chain elongation detecting device for detecting chain elongation in a transmission device including a chain for transmitting power to a driven sprocket, wherein the chain engagement height in a range where the drive sprocket or driven sprocket is engaged with the chain is determined. Using the mesh height measurement device to be measured and the signal acquired by the mesh height measurement device, obtain the difference in height between adjacent rollers in the chain, and calculate the amount of chain elongation from the obtained height difference. And a signal processing device for estimation.

According to the chain elongation detecting device according to the present invention, the engagement height measuring device for measuring the engagement height of the chain in the range where the drive sprocket or driven sprocket and the chain are engaged, and the engagement height measuring device A signal processing device is used to determine the difference in height between adjacent rollers in the chain using the acquired signal, and to estimate the extension of the chain from the calculated difference in height. It can be measured with high accuracy.

It is sectional drawing which shows the structure of the chain from which elongation is detected by the chain elongation detection apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the transmission apparatus provided with the chain of FIG. It is sectional drawing which shows the chain which the clearance gap produced in the sliding contact surface between the pin of FIG. 1, and a bush. FIG. 4 is a cross-sectional view showing a state in which tension is applied to the chain of FIG. 3. It is sectional drawing which shows the state which increased the number of links of the chain of FIG. It is a figure which shows meshing | engagement with the chain of the initial state and the driven sprocket which have not produced elongation. It is an enlarged view which shows the chain and driven sprocket of FIG. It is a figure which shows the winding state of the chain and driven sprocket which extend over the whole region. It is an enlarged view which shows the principal part of the chain and driven sprocket of FIG. It is a figure showing the movement amount from the pitch circle of each roller when uniform elongation arises over the whole region of a chain. It is a figure showing the amount of movement from the pitch circle of each roller when extension occurs only in a partial region of the chain. It is a figure showing the amount of movement from the pitch circle of each roller when extension occurs only in a partial region of the chain. It is a figure which shows the chain elongation detection apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the measurement position in the chain of FIG. It is a figure which shows the meshing height of a chain | strand when there is no elongation in a chain, or when elongation of a chain is small. It is a figure which shows the meshing height of a chain | strength when non-uniform elongation arises over the whole region of a chain. It is a figure which shows the meshing height of a chain when elongation arises in a part of chain. It is a figure which shows the method of calculating | requiring the meshing height by drawing chain | stretch elongation using CAD etc. FIG. It is a figure which shows the chain elongation detection apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the passenger conveyor which concerns on Embodiment 3 of this invention. It is a figure which shows the passenger conveyor which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
1 is a cross-sectional view showing the structure of a chain whose elongation is detected by a chain elongation detecting apparatus according to Embodiment 1 of the present invention. The chain 1 used for power transmission includes a pair of outer plates 11 provided opposite to each other, two pins 12 provided across the pair of outer plates 11, and a pair of pins provided opposite to each other. An inner plate 13, two bushes 14 formed in a cylindrical shape and provided over a pair of inner plates 13, and a roller 15 provided around each bush 14 are provided. A pair of outer plates 11 and a pair of inner plates 13 are alternately arranged in the longitudinal direction of the chain 1.

Each pin 12 is fixed to each outer plate 11 by caulking. Each bush 14 is fixed to each inner plate 13. A pin 12 is inserted into the bush 14. A pair of outer plates 11 and a pair of inner plates 13 that are adjacent to each other in the longitudinal direction are connected by inserting pins 12 into bushes 14. A portion of the chain 1 where the pin 12 is inserted into the bush 14 is a joint of the chain 1. In other words, the chain 1 can be bent at a portion of the chain 1 where the pin 12 is inserted into the bush 14.

A roller 15 is mounted around the bush 14 fixed to the inner plate 13, and the roller 15 is rotatable with respect to the bush 14. Therefore, the roller 15 meshes with the teeth of the sprocket while being rotatable with respect to the bush 14. The reference length of the chain 1 when evaluating the elongation of the chain 1 is defined by the dimension between the adjacent rollers 15. The reference length of the chain is called the reference pitch p of the chain 1.

FIG. 2 is a view showing a transmission device provided with the chain 1 of FIG. The transmission device includes a drive sprocket 2 that rotates when the driving force is transmitted, a driven sprocket 3 that is provided apart from the drive sprocket 2 and supported by a rotatable rotating shaft, and the drive sprocket 2 and the driven sprocket 3. And a chain 1 wound around. When the drive sprocket 2 rotates counterclockwise as shown by an arrow A in FIG. 2, the upper portion of the chain 1 between the drive sprocket 2 and the driven sprocket 3 becomes the tension side portion. The portion between the driving sprocket 2 and the driven sprocket 3 and the lower portion is the slack side portion. A tension corresponding to the transmitted load torque acts on the tight side portion of the chain 1. The tension according to the transmitted load torque does not act on the slack side portion of the chain 1, but the tension due to the weight of the slack side portion and the minute fluctuation caused by the vibration accompanying the rotation operation of the chain 1 acts.

In the part of the chain 1 that meshes with the sprocket, the angle of the joint is determined by the angle of each tooth determined by the number of sprocket teeth. In addition, the rotation and bending operation of the joint is performed as the chain 1 travels from the part of the chain 1 that starts to hook onto the sprocket to the part of the chain 1 that comes off the sprocket.

Since the tension according to the transmission torque acts on the joint in which the rotation / bending operation is performed, in the rotation / bending operation, the respective sliding contact surfaces between the pin 12 and the bush 14 have a sliding operation having a surface pressure. Is done. As a result, wear occurs on the contact sliding surfaces of the pin 12 and the bush 14. In particular, since both ends of the pin 12 are locally contacted with the corners of the bush 14, wear at both ends of the pin 12 is further promoted. Due to the wear of the contact sliding surface between the pin 12 and the bush 14, a gap is generated between the pin 12 and the bush 14 compared to the initial state. This gap is the main factor of chain 1 elongation.

3 is a cross-sectional view showing the chain 1 in which a gap is formed on the sliding contact surface between the pin 12 and the bush 14 in FIG. 1, and FIG. 4 is a cross-sectional view showing a state in which tension is applied to the chain 1 in FIG. FIG. 5 is a cross-sectional view showing a state where the number of links of the chain 1 of FIG. 4 is increased. FIG. 3 shows a state in which no tension is applied to the chain 1. A gap B is uniformly formed between the pin 12 and the bush 14 due to aged sliding wear.

When a tension is applied to the chain 1, the pin 12 moves relative to the bush 14 by the dimension of the gap B between the pin 12 and the bush 14, and the pin 12 and the bush 14 come into contact with each other. The evaluation of the elongation of the chain 1 is defined by the dimension between adjacent rollers 15 and is measured by how much it has changed with respect to the reference pitch p.

Both ends of the bush 14 are fixed to the inner plate 13, and the distance between the centers of the pair of bushes 14 fixed to the same inner plate 13 is set to the reference pitch p of the chain 1. The distance between the pair of bushes 14 fixed to the same inner plate 13 does not change unless the inner plate 13 extends. From the allowable tension of the chain 1 and the material and shape of the inner plate 13, the tension between the pair of bushes 14 fixed to the same inner plate 13 does not change with the tension acting by normal torque transmission.

The distance between the centers of the pair of adjacent bushes 14 is the same as the distance between the centers of the pair of adjacent rollers 15. When comparing the chain 1 extended by the gap B generated between the pin 12 and the bush 14 by sliding wear and the chain 1 in the initial state without sliding wear, the same outer plate 11 is used in the extended chain 1. Only the distance between the pair of rollers 15 provided on the base plate 13 extends with respect to the reference pitch p, and the dimension between the pair of rollers 15 provided on the same inner plate 13 does not change. That is, the elongation of the chain 1 due to the gap B between the pins 12 and the bush 14 caused by the sliding wear over time occurs only between the pair of rollers 15 provided on the same outer plate 11. In other words, every other interval between the adjacent rollers 15 is elongated.

Next, the meshing between the chain 1 and the driven sprocket 3 will be described. FIG. 6 is a diagram showing meshing between the chain 1 and the driven sprocket 3 in an initial state where no elongation occurs, and FIG. 7 is an enlarged view showing the chain 1 and the driven sprocket 3 in FIG. In the actual chain 1, a minute gap is provided between each member so that smooth operation is performed, and the gap 1 appears as an extension in the chain 1 from the initial state, but in this embodiment 1, This gap is an error.

The pitch length p of the chain 1 is determined by the standard for the model number corresponding to the tensile strength of the chain 1. Using the pitch length p of the chain 1 and the number of teeth z of the driven sprocket 3, the chain 1 meshes with the teeth of the driven sprocket 3 at the position of the pitch diameter D obtained from the following equation (1).

D × sin (180 / Z) = p (1)

Since the pitch diameter D is uniquely determined when the model number of the chain 1 and the number of teeth z of the driven sprocket 3 are determined, the position of the roller 15 in the driven sprocket 3 can be obtained in advance by geometric drawing.

Next, a description will be given of a case where the chain 1 is stretched uniformly over the entire area. Conventionally, when the chain 1 is uniformly extended, the roller 15 is positioned at the position of the pitch diameter D calculated using a value obtained by adding the length Δp of the elongation to the pitch length p in the above formula (1). Was supposed to mesh with the driven sprocket 3.

However, as shown in FIG. 5, the chain 1 has a change in the pitch length p as an extension only for the distance between the centers of a pair of rollers 15 provided on the same outer plate 11 for structural reasons. The distance between the centers of the pair of rollers 15 provided on the same inner plate 13 does not change. In other words, in the chain 1 that has uniformly stretched over the entire circumference, the stretch occurs in the distance between the centers of the adjacent rollers 15 only in the portion of the outer plate 11. A change in the distance between the centers of the adjacent rollers 15 occurs. As a result, the meshing position of the roller 15 within the teeth of the driven sprocket 3 when the chain 1 is stretched cannot be obtained uniformly by the above equation (1).

Next, the winding state of the chain 1 and the driven sprocket 3 in a state where power is transmitted will be described. In a state where the chain 1 does not extend over the entire area, the roller 15 moves within the range wound around the driven sprocket 3 at the position of the pitch diameter D calculated by the above equation (1). Mesh with.

FIG. 8 is a view showing a state where the chain 1 and the driven sprocket 3 extending over the entire region are wound, and FIG. 9 is an enlarged view showing the main parts of the chain 1 and the driven sprocket 3 in FIG. Regardless of the state of elongation of the chain 1, there are teeth in the same meshing state as when the chain 1 having no elongation is wound in the range of the driven sprocket 3 around which the chain 1 is wound.

This tooth is on an extension of the line connecting the rotation axes of the drive sprocket 2 and the driven sprocket 3 based on experience. The exact position moves in accordance with changing conditions such as the load applied to the chain 1, the dead weight of the bending side portion of the chain 1, and the friction coefficient of the tooth surface of the driven sprocket 3. In the first embodiment, the teeth on the extension lines of the lines connecting the respective rotation shafts of the drive sprocket 2 and the driven sprocket 3 are wound around the chain 1 that does not extend regardless of the extension state of the chain 1. Teeth that are in the same meshing state as if they were present.

The distance between a pair of rollers 15 provided on the same outer plate 11, and the distance between a pair of rollers 15 provided on the same inner plate 13 does not change. The distance increase occurs every other roller among the plurality of rollers 15 arranged. In FIG. 9, the broken line is represented as the inner plate 13 and the solid line is represented as the outer plate 11 in order from the teeth meshing at the same position as the meshing position when the chain 1 is not stretched.

When the first roller 15a disposed on the rear side of the inner plate 13 in the rotational direction of the driven sprocket 3 is in a position where the first roller 15a meshes with the driven sprocket 3 on a pitch circle in a state where the driven sprocket 3 does not stretch, the first roller 15a Since the second roller 15b on the front side in the rotational direction is arranged coaxially with the bush 14 fixed to the same inner plate 13 as the first roller 15a, the distance between the axes is equal to the chain pitch. . Therefore, the second roller 15b is also on the pitch circle.

The third roller 15c, one on the front side in the rotational direction with respect to the second roller 15b, is disposed coaxially with the bush 14 through which the pin 12 fixed to the same outer plate 11 as the pin 12 that passes through the second roller 15b passes. Has been. Since the distance between the pair of bushes 14 provided on the outer plate 11 is increased by the gap B between the pins 12 and the bushes 14, the distance between the axes of the second roller 15b and the third roller 15c is increased. Increases with respect to the chain pitch. Since the third roller 15c rotates as a radius having a length longer than the chain pitch around the axis of the second roller 15b, the next tooth in the driven sprocket 3 is less than the pitch circle of the driven sprocket 3. Even mesh on a circle with a large radius. This means that the teeth of the driven sprocket 3 mesh with each other at a position shifted from the tooth bottom to the tooth tip in the radial direction of the driven sprocket 3.

Since the fourth roller 15d is coaxial with the bush 14 fixed to the same inner plate 13 as the third roller 15c, the distance between the axes of the fourth roller 15d and the third roller 15c is equal to the chain pitch. Since the third roller 15c is positioned within the tooth of the driven sprocket 3 on a circle having a radius larger than the pitch diameter of the driven sprocket 3, the fourth roller rotates around the axis of the third roller 15c with the chain pitch as the radius. 15d is located on a circle having a smaller radius than the circle centered on the center of the driven sprocket 3 where the third roller 15c is located.

In this way, the roller 15 that is forward in the rotational direction of the outer plate 11 starts from the roller 15 that meshes with the teeth of the driven sprocket 3 on the pitch circle as in the chain that does not stretch, and the driven sprocket within the teeth of the driven sprocket 3. The roller 15 positioned next to the center of the driven sprocket 3 is engaged with the inside of the tooth at a position farther from the center of the driven sprocket 3.

FIG. 10 is a diagram showing the amount of movement of each roller 15 from the pitch circle when uniform elongation occurs over the entire chain 1. In FIG. 10, the respective moving amounts are shown in the order of the second roller 15b and the third roller 15c arranged forward in the rotational direction from the first roller 15a to the first roller 15a. With respect to the roller 15 that is located somewhat forward in the rotational direction with respect to the first roller 15 a located on the pitch circle of the driven sprocket 3, the position of the roller 15 that is far from the center of the driven sprocket 3 and the roller that is close to the center of the driven sprocket 3. The position of 15 settles to a certain value.

FIG. 11 is a diagram showing the amount of movement of each roller 15 from the pitch circle when elongation occurs in only a part of the chain 1. FIG. 11 shows the amount of movement of each roller 15 when the roller 15 in the stretched portion of the chain 1 meshes with the teeth of the driven sprocket 3 on the pitch circle. As can be seen from the figure, some of the rollers 15 arranged forward in the rotational direction with respect to the rollers 15 on the pitch circle are far away from the pitch circle. Further, the positions of the plurality of rollers 15 arranged forward in the rotational direction with respect to the roller 15 having a large movement amount from the pitch circle gradually approach the pitch circle.

FIG. 12 is a diagram showing the amount of movement of each roller 15 from the pitch circle when elongation occurs only in a partial region of the chain 1. In FIG. 12, the amount of movement of each roller 15 when the roller 15 in the stretched portion of the chain 1 is ahead in the rotational direction with respect to the roller 15 meshed with the teeth of the driven sprocket 3 on the pitch circle is shown. Represents. As can be seen, the meshing position of the roller 15 in the chain 1 where no elongation occurs is on the pitch circle, and the meshing position of the roller 15 in the portion of the chain 1 where the elongation has occurred moves greatly from the pitch circle. To do.

From the above, whether the uniform elongation occurs over the entire region of the chain 1 or the elongation of only a part of the chain 1 occurs on the pitch circle in meshing with the driven sprocket 3. A mesh height position having a correlation with the amount of extension can be detected at a position approximately 15 teeth ahead in the rotational direction from the position of the meshing roller 15.

Next, a description will be given of a method for estimating the extension position of the chain 1 and the amount of extension using the characteristics of the extension of the chain 1 and the engagement of the roller 15 with the driven sprocket 3. FIG. 13 is a view showing a chain elongation detecting apparatus according to Embodiment 1 of the present invention. A chain 1 is wound around a driving sprocket 2 having a driving force and a driven sprocket 3 serving as a load. Power from the drive sprocket 2 is transmitted to the driven sprocket 3 via the chain 1.

The chain elongation detecting device includes a mesh height measuring device 4 that measures the height of the roller, and a signal processing device 5 to which a measurement result of the mesh height measuring device 4 is input. In the driven sprocket 3, the mesh height measuring device 4 is installed at a position 15 or more teeth away from the teeth meshing with the driven sprocket 3 on the pitch circle in the rotational direction. The meshing height measuring device 4 measures the height of the chain 1 in the teeth of the driven sprocket 3. In this example, a non-contact displacement meter using a laser is used as the mesh height measuring device 4. In this example, the mesh height measuring device 4 measures the height of the chain 1 in the teeth of the driven sprocket 3, but measures the height of the chain 1 in the teeth of the drive sprocket 2. Also good.

FIG. 14 is a diagram showing a measurement position in the chain 1 of FIG. In the measurement of the height of the chain 1 in the teeth of the driven sprocket 3, the portion where the radial position changes from the center of the driven sprocket 3 together with the mesh height as shown by points a to c in FIG. To do. Thereby, the mesh height measuring device 4 can measure the change in the mesh height of the chain 1 in the teeth by irradiating the points a to c in FIG. 14 with laser. In the meshing height measuring step, a change in the meshing height of the chain 1 is measured.

The signal obtained by the mesh height measuring device 4 is sent to the signal processing device 5. In the signal processing device 5, a signal processing step is performed. The signal processing device 5 uses the signal sent from the mesh height measuring device 4 to determine whether or not there is an extended state across the entire chain 1. Specifically, in the signal processing device 5, when the chain 1 is not stretched or when the chain 1 is stretched small, the meshing height in each tooth of each roller 15 is large as shown in FIG. A waveform with no difference is obtained.

On the other hand, when uneven stretching occurs over the entire region of the chain 1, the signal processing device 5 has a meshing height every other roller 15 arranged as shown in FIG. A changing waveform can be obtained. Further, when elongation occurs in a part of the chain 1, in the signal processing device 5, the meshing position of the stretched part as shown in FIG. 17 is clearly different from the meshing position of the other part. A position waveform is obtained. Further, the approximate elongation rate of the chain 1 is obtained by using the difference in meshing height between the adjacent rollers 15 shown in FIG. 16 and the difference in meshing height between the uniform waveform portion and the maximum displacement portion shown in FIG. Can be estimated. Specifically, the difference in meshing height between adjacent rollers 15 shown in FIG. 16, the difference in meshing height between the uniform waveform portion and the maximum displacement portion shown in FIG. 17, and the chain 1 to be measured in advance. The approximate elongation rate of the chain 1 can be estimated by comparing with a value obtained by drawing using CAD or the like from the above specifications.

FIG. 18 is a diagram showing a method for obtaining the meshing height by stretching of the graphic chain 1 using CAD or the like. First, the first roller 15a meshed with an ideal position in the tooth of the driven sprocket 3 is assumed. Here, the surface of the first roller 15 a is in contact with the tooth surface of the tooth 3 </ b> A of the driven sprocket 3. Here, the radius of the roller 15 is r.

The second roller 15b adjacent to the first roller 15a in the rotational direction moves on a circumference having a chain pitch p as a radius from the center of the first roller 15a. The second roller 15b having a radius r is moved along a circumference centered on the center of the first roller 15a meshed with the teeth 3a of the driven sprocket 3, and the tooth surfaces of the teeth 8b of the driven sprocket 3 and the second roller 15b The position where the surface contacts is obtained by drawing. The position thus determined is the meshing position between the driven sprocket 3 and the second roller 15b, and the distance between the center of the driven sprocket 3 and the center of the second roller 15b at this time is the meshing height of the second roller 15b. It becomes. Similarly to the second roller 15b, the meshing position and the meshing height of the third roller 15c can be obtained.

The information on the meshing position and the meshing height of the roller 15 is information that is uniquely obtained geometrically when the shape of the driven sprocket 3, the chain pitch length, and the shape of the roller 15 are determined. In addition to the procedure shown in FIG. 18, it can be obtained using a general-purpose geometric tool.

According to the chain elongation detecting device according to the first embodiment of the present invention, the chain 1 can be evaluated for elongation over the entire region of the chain 1 when the chain 1 is in a normal driving state, and the chain 1 can be uniformly distributed over the entire region. The amount of elongation can be estimated, and for local elongation, the position where elongation occurs along with the amount of elongation by providing a convex part that clearly gives the signal a specific displacement for a specific link at the measurement point Can also be confirmed.

Embodiment 2. FIG.
FIG. 19 is a view showing a chain stretch detection device according to Embodiment 2 of the present invention. The chain stretch detection device according to Embodiment 2 of the present invention further includes an external alarm device 6 that receives a signal from the signal processing device 5. The external alarm device 6 automatically measures the amount of elongation from the mesh height waveform sent to the signal processing device 5, displays that there is elongation, and when local elongation is detected, the elongation is detected. The part where is generated is displayed. Therefore, the external alarm device 6 has a display unit. Also, the external alarm device notifies the outside that the chain 1 has been stretched by emitting light or sounding the outside.

As described above, according to the chain elongation detecting device according to the second embodiment of the present invention, the elongation of the chain 1 can be known without recalculating from the signal obtained by the signal processing device 5, and locally. When the chain 1 is stretched, the position can be specified while operating the chain 1 at the time of measurement.

Embodiment 3 FIG.
FIG. 20 is a diagram showing a passenger conveyor according to Embodiment 3 of the present invention. A passenger conveyor according to Embodiment 3 of the present invention includes a casing 71, a power unit 72 that generates a driving force, a driving sprocket 2 attached to an output shaft of the power unit 72, a driven sprocket 3, and a driving sprocket. 2 and the chain 1 wound around the driven sprocket 3, the main shaft 73 to which the driven sprocket 3 is attached, a step 74 that moves when the main shaft 73 rotates, and a control panel that controls the operation of the power source and the passenger conveyor. And a stored controller unit 75. The power unit, the drive sprocket 2, the driven sprocket 3, the chain 1, the main shaft, the step, and the controller unit are stored inside the housing.

Chain 1 is responsible for transmitting all the power required for the passenger conveyor. Therefore, the tension is always applied to the chain 1 when the passenger conveyor is driven. Therefore, it is expected that aged growth will occur in the chain 1. Therefore, in order to always operate the passenger conveyor in a good state, it is required to measure the elongation of the chain 1 periodically and prevent deterioration of the state due to the elongation of the chain 1 beforehand.

In the third embodiment, the chain elongation detecting device described in the first or second embodiment is used during periodic inspection of the chain 1 of the passenger conveyor. In general, the power unit 72 is a high-speed motor with a relatively small output torque for the purpose of reducing the size of the power unit 72. The reducer decelerates the output of the motor by the chain 1. As a result, a large torque is transmitted to the main shaft 73 at a low speed. In order to decelerate with the chain drive system, the driven sprocket 3 has the same number of teeth as the reduction ratio with respect to the drive sprocket 2. Therefore, the number of teeth meshed with the chain 1 in the driven sprocket 3 is larger than the number of teeth meshed with the chain 1 in the drive sprocket 2. As shown in FIG. 10, in the chain elongation detecting device described in the first embodiment or the second embodiment, the engagement of teeth arranged forward in the rotational direction by a certain number of teeth from the roller 15 engaged in the tooth bottom. It is characterized by measuring a large height, and it is more suitable to detect the elongation of the chain 1 in the driven sprocket 3 having a large number of meshing teeth than to detect the elongation of the chain 1 in the driving sprocket 2.

In the third embodiment, the meshing height measuring device 4 is arranged near the portion of the chain 1 where the meshing of the driven sprocket 3 integrated with the main shaft 73 comes off and fixed to the casing 71, and the meshing height is measured. It is characterized by measuring the thickness. At that time, the signal processing device 5 for processing the measured signal and the external notification device 6 for notifying the outside of the measurement result are also installed and used together with the mesh height measuring device 4 at the time of inspection.

As described above, according to the passenger conveyor according to Embodiment 3 of the present invention, the elongation of the chain 1 can be easily measured at the time of inspection with respect to the currently installed passenger conveyor.

Embodiment 4 FIG.
FIG. 21 shows a passenger conveyor according to Embodiment 4 of the present invention. In the fourth embodiment, a signal obtained by the mesh height measuring device 4 fixed to the housing is taken into a control panel stored in the controller unit 75, and the chain 1 is stretched and localized as functions of the control panel. It is characterized by detecting the position of elongation and displaying each piece of information on the outside. Other configurations are the same as those of the third embodiment.

As described above, according to the passenger conveyor according to the fourth embodiment of the present invention, since it is possible to always monitor the elongation of the chain 1 as well as at the time of periodic inspection, periodic inspection is unnecessary. Thus, the reliability of the passenger conveyor can be improved along with the reduction of work.

1 chain, 2 drive sprocket, 3 driven sprocket, 4 mesh height measuring device, 5 signal processing device, 6 external alarm device, 11 outer plate, 12 pin, 13 inner plate, 14 bush, 15 roller, 71 housing , 72 power section, 73 spindle, 74 steps, 75 controller section.

Claims

A driving sprocket that rotates when a driving force is transmitted, a driven sprocket supported by a rotatable rotating shaft, and is wound around the driving sprocket and the driven sprocket, and transmits the power of the driving sprocket to the driven sprocket. A chain elongation detecting device for detecting the elongation of the chain in a transmission device comprising a chain,
A mesh height measuring device for measuring a mesh height of the chain in a range where the drive sprocket or the driven sprocket meshes with the chain;
A signal processing device that obtains a difference in height between adjacent rollers in the chain using a signal acquired by the meshing height measuring device, and estimates an extension amount of the chain from the obtained height difference; Elongation detector with chain.
The signal processing device includes: an amount of extension of the chain when the chain is locally extended and a portion where the chain is locally extended due to the difference in height between the adjacent rollers in the chain. The chain elongation detection device according to claim 1, wherein
The chain elongation detection device according to claim 1 or 2, further comprising a display unit that displays an amount of elongation of the chain estimated by the signal processing device.
3. The display device according to claim 2, further comprising: a display unit configured to display an amount of the chain extension when the chain elongation estimated by the signal processing device is generated and a portion where the chain elongation is locally generated. Chain elongation detection device.
The meshing height measuring device is configured so that a portion of the chain that is in a forward position with respect to a rotational direction of 15 teeth or more from a tooth closest to a linear extension line connecting the rotation axis of the drive sprocket and the rotation axis of the driven sprocket. The chain elongation detecting device according to any one of claims 1 to 4, wherein the chain height is measured.
A driving sprocket that rotates when a driving force is transmitted, a driven sprocket supported by a rotatable rotating shaft, and is wound around the driving sprocket and the driven sprocket, and transmits the power of the driving sprocket to the driven sprocket. A chain elongation detecting method for detecting elongation of the chain of a transmission device comprising a chain that comprises:
A mesh height measuring step of measuring a mesh height of the chain in a range where the drive sprocket or the driven sprocket meshes with the chain;
A signal processing step of obtaining a difference in height between adjacent rollers in the chain using the signal acquired in the meshing height measurement step, and estimating an elongation amount of the chain from the obtained difference in height. Chain elongation detection method with
A driving sprocket that rotates when a driving force is transmitted from the motor;
A driven sprocket connected to a step drive device for driving the step and supported by a rotatable rotary shaft;
A chain wound around the drive sprocket and the driven sprocket and transmitting the power of the drive sprocket to the driven sprocket;
A mesh height measuring device for measuring a mesh height of the chain in a range where the drive sprocket or the driven sprocket meshes with the chain;
A signal processing device that obtains a difference in height between adjacent rollers in the chain using a signal acquired by the meshing height measuring device, and estimates an extension amount of the chain from the obtained height difference; With passenger conveyor.
The passenger conveyor according to claim 7, wherein the engagement height measuring device measures an engagement height of the chain in a range where the driven sprocket and the chain are engaged.